I am using the Generic RGB profile instead of the Color LCD profile (in Display → Color Settings). But when the generic profile is active, my color picker picks darker colours.
For example, if I repeatedly pick a color from the picker, it gets darker each time. So it doesn't pick the same color, it takes the color and gives me darker shade of this color. This problem only happens in the Generic RGB profile, not in the Color LCD profile.
I tried this on my MacBook Pro 2011 (it is also Mountain Lion) and the problem remains. Is this a problem unique to Mountain Lion, or something else?